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import datetime
from .. import db
class BaseStorage:
def __init__(self, app):
self.app = app
def add_file(self, file_hash, filename, size, user=None, ip=None):
'''Adds the file to the database.
Call from store_file after the file is successfully stored.'''
with db.session_scope() as sess:
f = db.File(file_hash, filename, size, datetime.datetime.utcnow(), user.id if user else None, ip)
sess.add(f)
sess.commit()
sess.refresh(f)
return f
def store_file(self, uploaded_file, file_hash, filename, user, ip):
'''Store uploaded_file.'''
raise NotImplementedError()
def get_file(self, f):
'''Return a file object for the specified file.
Subclasses can also return a flask.Response instance if required.'''
raise NotImplementedError()
def delete_file(self, f):
'''Delete the specified file.'''
raise NotImplementedError()
def temp_file(self, f):
'''Context manager which returns a temporary file for reading.
This is used internally for eg. thumbnails.'''
raise NotImplementedError()
def get_thumbnail(self, f):
'''Return a file object for the specified file's thumbnail.
Subclasses can also return a flask.Response instance if required.'''
raise NotImplementedError()
def store_thumbnail(self, f, stream):
'''Store thumbnail for the specified file.'''
raise NotImplementedError()
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